[PATCH net-next 2/2] mlx4: add gettimex64() ptp method

[Mahesh Bandewar <maheshb@google.com>]

Introduce the gettimex64() PTP method implementation, which enhances
the PTP clock read operation by providing pre- and post-timestamps to
determine the clock-read-call-width.

Signed-off-by: Mahesh Bandewar <maheshb@google.com>
---
 drivers/net/ethernet/mellanox/mlx4/en_clock.c | 21 +++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_clock.c b/drivers/net/ethernet/mellanox/mlx4/en_clock.c
index 69c5e4c5e036..d3f6ece1531e 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_clock.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_clock.c
@@ -202,6 +202,26 @@ static int mlx4_en_phc_gettime(struct ptp_clock_info *ptp,
 	return 0;
 }
 
+static int mlx4_en_phc_gettimex(struct ptp_clock_info *ptp,
+				struct timespec64 *ts,
+				struct ptp_system_timestamp *sts)
+{
+	struct mlx4_en_dev *mdev = container_of(ptp, struct mlx4_en_dev,
+						ptp_clock_info);
+	unsigned long flags;
+	u64 ns;
+
+	write_seqlock_irqsave(&mdev->clock_lock, flags);
+	/* refresh the clock_cache but get the pre/post ts */
+	mlx4_en_read_clock(mdev, sts);
+	ns = timecounter_read(&mdev->clock);
+	write_sequnlock_irqrestore(&mdev->clock_lock, flags);
+
+	*ts = ns_to_timespec64(ns);
+
+	return 0;
+}
+
 /**
  * mlx4_en_phc_settime - Set the current time on the hardware clock
  * @ptp: ptp clock structure
@@ -255,6 +275,7 @@ static const struct ptp_clock_info mlx4_en_ptp_clock_info = {
 	.adjfine	= mlx4_en_phc_adjfine,
 	.adjtime	= mlx4_en_phc_adjtime,
 	.gettime64	= mlx4_en_phc_gettime,
+	.gettimex64	= mlx4_en_phc_gettimex,
 	.settime64	= mlx4_en_phc_settime,
 	.enable		= mlx4_en_phc_enable,
 };
-- 
2.47.0.rc0.187.ge670bccf7e-goog